Theories, Hypotheses, and Laws

What is the best definition of the term "theory," as it is used in science?

a.A theory is a guess or hunch about something that has occurred in nature.

b.A theory is a comprehensive set of ideas explaining a phenomenon in nature.

c.A theory is based on verifiable laws and can be proven true.

d.A theory is a hypothesis that uses laws and observation to make an assumption.

While speaking to a colleague, a scientist makes the following statement: "I propose that Bald Eagle eggs in northern Maine will have thinner shells than those from birds in southern Alaska due to increased levels of pesticides in the water." This statement is a

a.theory

b.law

c.conclusion

d.hypothesis

Scientific theories can be tested.

a.true

b.false

Complete the following sentence so that it is correct: Scientific theories are based on

a.general assumptions of how systems work.

b.mathematical principles that can be proven true.

c.large amounts of data collected over time.

d.observations from within only one scientific discipline.

Why are scientific theories an important part of research and understanding?

a.Scientific theories allow scientists to make predictions.

b.Scientific theories allow scientists to make assumptions.

c.Scientific theories determine the work that future scientists can do.